LP#1206649 un-cancel received lineitems / copies

Clear the cancel reason when a canceled lineitem is marked as received.
With items, clear the cancel reason and re-generate fund debits if they
were removed during cancelation (because the keep_debits flag in the
cancel reason was set to false).

Signed-off-by: Bill Erickson <berick@esilibrary.com>
Signed-off-by: Mike Rylander <mrylander@gmail.com>